/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.constant;

import proguard.classfile.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.visitor.ClassVisitor;

/**
 * This Constant represents a class constant in the constant pool.
 *
 * @author Eric Lafortune
 */
public class ClassConstant extends Constant {
    public int u2nameIndex;

    /**
     * An extra field pointing to the referenced Clazz object. This field is filled out by the <code>{@link
     * proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}</code>.
     */
    public Clazz referencedClass;

    /**
     * An extra field pointing to the java.lang.Class Clazz object. This field is typically filled out by the
     * <code>{@link
     * proguard.classfile.util.ClassReferenceInitializer
     * ClassReferenceInitializer}</code>..
     */
    public Clazz javaLangClassClass;

    /**
     * Creates an uninitialized ClassConstant.
     */
    public ClassConstant() {}

    /**
     * Creates a new ClassConstant with the given name index.
     * 
     * @param u2nameIndex the index of the name in the constant pool.
     * @param referencedClass the referenced class.
     */
    public ClassConstant(int u2nameIndex, Clazz referencedClass) {
        this.u2nameIndex = u2nameIndex;
        this.referencedClass = referencedClass;
    }

    /**
     * Returns the name.
     */
    public String getName(Clazz clazz) {
        return clazz.getString(u2nameIndex);
    }

    // Implementations for Constant.

    public int getTag() {
        return ClassConstants.CONSTANT_Class;
    }

    public void accept(Clazz clazz, ConstantVisitor constantVisitor) {
        constantVisitor.visitClassConstant(clazz, this);
    }

    /**
     * Lets the referenced class accept the given visitor.
     */
    public void referencedClassAccept(ClassVisitor classVisitor) {
        if (referencedClass != null) {
            referencedClass.accept(classVisitor);
        }
    }
}
